Adaptive cell reselection

Abstract

Idle power consumption of a user equipment (UE) is affected by an adaptive cell reselection process to prevent ping-pong cell reselection. The adaptive cell reselection includes adapting triggering threshold values for reselection based on signal strengths. The triggering threshold value may be increased for cell reselection while the UE receives a good signal from a serving cell. When the serving cell signal is poor, the cell reselection triggering threshold value is decreased to allow for fast cell reselection.

What is claimed is:  
     
         1 . A method of wireless communication, comprising:
 increasing a triggering threshold value for cell reselection when a plurality of neighbor cell signal strengths are each within a predefined range of a serving cell signal strength, and the serving cell signal strength is above a first predefined threshold value.   
     
     
         2 . The method of  claim 1 , further comprising decreasing the triggering threshold value when the serving cell signal strength is below a second predefined threshold value. 
     
     
         3 . The method of  claim 1 , further comprising decreasing the triggering threshold value when only one of the plurality of neighbor cell signal strengths remains within the predefined range of the serving cell signal strength. 
     
     
         4 . The method of  claim 1 , in which the triggering threshold value comprises an inter-frequency triggering threshold value. 
     
     
         5 . The method of  claim 1 , in which the triggering threshold value comprises an inter-radio access technology (IRAT) triggering threshold value. 
     
     
         6 . A method of wireless communication, comprising:
 triggering inter-radio access technology (IRAT) cell reselection only when both a signal quality of a serving cell and a signal quality of a neighbor cell are below a threshold value, the neighbor cell and the serving cell being of the same RAT.   
     
     
         7 . An apparatus for wireless communication, comprising:
 means for increasing a triggering threshold value for cell reselection when a plurality of neighbor cell signal strengths are each within a predefined range of a serving cell signal strength, and the serving cell signal strength is above a first predefined threshold value; and   means for triggering reselection based on the increased triggering threshold value.   
     
     
         8 . The apparatus of  claim 7 , further comprising means for decreasing the triggering threshold value when the serving cell signal strength is below a second predefined threshold value. 
     
     
         9 . The apparatus of  claim 7 , further comprising means for decreasing the triggering threshold value when only one of the plurality of neighbor cell signal strengths remains within the predefined range of the serving cell signal strength. 
     
     
         10 . An apparatus for wireless communication, comprising:
 means for triggering inter-radio access technology (IRAT) cell reselection only when both a signal quality of a serving cell and a signal quality of a neighbor cell are below a threshold value, the neighbor cell and the serving cell being of the same RAT; and   means for communicating according to the reselection.   
     
     
         11 . An apparatus for wireless communication, comprising:
 a memory; and   at least one processor coupled to the memory and configured:
 to increase a triggering threshold value for cell reselection when a plurality of neighbor cell signal strengths are each within a predefined range of a serving cell signal strength, and the serving cell signal strength is above a first predefined threshold value. 
   
     
     
         12 . The apparatus of  claim 11 , in which the at least one processor is further configured to decrease the triggering threshold value when the serving cell signal strength is below a second predefined threshold value. 
     
     
         13 . The apparatus of  claim 11 , in which the at least one processor is further configured to decrease the triggering threshold value when only one of the plurality of neighbor cell signal strengths remains within the predefined range of the serving cell signal strength. 
     
     
         14 . The apparatus of  claim 11 , in which the triggering threshold value comprises an inter-frequency triggering threshold value. 
     
     
         15 . The apparatus of  claim 11 , in which the triggering threshold value comprises an inter-radio access technology (IRAT) triggering threshold value. 
     
     
         16 . An apparatus for wireless communication, comprising:
 a memory; and   at least one processor coupled to the memory and configured:
 to trigger inter-radio access technology (IRAT) cell reselection only when both a signal quality of a serving cell and a signal quality of a neighbor cell are below a threshold value, the neighbor cell and the serving cell being of the same RAT. 
   
     
     
         17 . A computer program product for wireless communications in a wireless network, comprising:
 a computer-readable medium having non-transitory program code recorded thereon, the program code comprising:   program code to increase a triggering threshold value for cell reselection when a plurality of neighbor cell signal strengths are each within a predefined range of a serving cell signal strength, and the serving cell signal strength is above a first predefined threshold value.   
     
     
         18 . The computer program product of  claim 17 , in which the program code further comprises code to decrease the triggering threshold value when the serving cell signal strength is below a second predefined threshold value. 
     
     
         19 . The computer program product of  claim 17 , in which the program code further comprises code to decrease the triggering threshold value when only one of the plurality of neighbor cell signal strengths remains within the predefined range of the serving cell signal strength. 
     
     
         20 . A computer program product for wireless communications in a wireless network, comprising:
 a computer-readable medium having non-transitory program code recorded thereon, the program code comprising:   program code to trigger inter-radio access technology (IRAT) cell reselection only when both a signal quality of a serving cell and a signal quality of a neighbor cell are below a threshold value, the neighbor cell and the serving cell being of the same RAT.